Feed mechanism for mixing-mills.



P. E. WELTON.

FEED MECHANISM FOR MIXING MILLS.

APPLICATION FILED NOV. 4, 1914.

Patented Feb. 29, 1916.

3 SHEETS SHEET I.

P. E. WELTON.

FEED MECHANISM FOR MIXING MILLS.

APPLICATION FILED NOV. 4, i914- 3 SHEETS SHEET 2.

Patented Feb. 29, 1916.

2 NW 6 D P. E. WELTON.

FEED MECHANISM FOR MIXING MILIs.

APPLICATION FILED NOV. 4,1914.

1,173,625. Patented Feb. 29, 1916.

3 SHEETS*-SHEET 3.

'4 la d/1 111111 gw g 92M 5 my My WM Z 0 52% Z7 M fiATPIiZQ PATENT nTQHI, 1E" iSUYAfk-FGA FALL E UYAHOGA uxtim of Letter P imam 3 5nd thencei1 up over roll 16. The roll 16 is rotatively mounted in brackets 14located adjacent to opposite sides of the pan 12 near the rear endthereof, which brackets are preferably secured to two movable rods 47 tobe presently described. The roll 22 is rotatively mounted in brackets21. These are located near opposite sides of the front end of the pan,and loosely embrace the two rods 47 so as to be capable of slidingthereon. Each bracket is, however, under the influence bf a spring whichembraces the associated rod 47,said spring being compressed between saidbrackets and a collar on said rod. The ends of the roll 28 are ratherloosely mounted in bearing brackets 27, each of which is rigid with acylinder 26.

Each cylinder is slidably mounted on a rod 25, whose lower end isrigidly fixed to and is therefore, in effect, a part of a lever 23. Thetwo levers 23 are independently pivoted on opposite sides of the pan,orrather to bearing brackets 13 rigidly secured to opposite sides of thepan. The two rods 25 extend upward from said levers, and at an angletoward the mixing roll 10, so that, when the device is in use, the upperends of said rods will overhang the front part of the mixing roll 10.

A piston 29 is rigidly connected with each rod 25 within the associatedcylinder. Each rod 25 has through it a duct 25, which, at its upper end,discharges into the cylinder 26 above the piston. At its lower end eachduct is connected with a supply pipe 45, from which compressed air orsteam may be discharged into duct 25, and thence into the cylinder. Theresult will be to yieldingly move said cylinder up on its supporting rod25 as far as is necessary to keep the adjacent part of the feed apron 30tigh The upward movement of each cylinder upon its supporting rod may belimited by its engagement with an adjustable nut 32 which may be screwedup and down upon the threaded end of the rod 25 by means of a hand wheel32 The pull applied to the apron by the stated movements of theassociated cylinders upward on the supporting rod will draw the feedapron tightly against the mixing roll 10, and will cause the supportinglevers 25-23 to swing on their pivots toward the mixing roll 10. Now,when the apparatus is in use, and lumps of the mixture get betweenthe'apron and the mixing roll tending to tighten the apron near one orthe other edge thereof, the corresponding cylinder 26 will yielddownward, the corresponding-lever 25-23 may swing slightly away from themixing roll, and thereby this part of the belt will be so loosened tofacilitate the passage of the lump without injury to. the apron. Theopposite edges ofthe apron, adjacent to the mixing roll, will travel atdifferent rates when lumps of material are unequally dis tributedthereon, and between the apron and feed roll, and therefore the apronwill tend to move laterally, if this tendency is not overcome. Themechanism contains several 7 features, each of which alone does much toprevent this lateral movement, and all cooperate to practically preventany lateral movement of said apron. Perhaps the most important expedientfor producing this result is the clamping of the apron from side to sidebetween a roll 37, and the roll 22, the latter being, as stated, underthe influ ence of two springs 60 acting to yieldingly press it towardroll 37. When the moving apron is so clamped between the two revolv ingrolls 37 and 22, all parts of the apron. as it asses between theserolls, will be compelle to move at the same rate. There will be a slightpuckering of one side or of the other side of the down running leg ofthe feed apron, between the rolls 28 and 37, but that is a matter of noimportance. Said apron has preferablya rib 30 along its under sideadjacent to each edge, as shown in Fig. 4. The parts of the apron rolls1 22 and 28, neartheir ends, beneath this rib are of reduced diameter(as at 28) to at commodate this rib. A little roller 45 carried by eachcylinder 26 engages each ribbe g5 edge of the apron and holds it downbehind the shoulder 28 forn'ted by reducing the diameter of roll 28.

In order to further insure that when an extra large lump of materialpasses between we the apron and mixing roll nothing will be broken, theendwise movable rods 1? are provided on opposite sides of the pan. Eachis slidably mounted in bearing brackets 48 fixed to the pan; andbrackets ll. in 05 which the rolls 16, 17 and 18 are mounted, aresecured to these rods. lVhen therefore :there is an extra large lump ofmaterial between the apron and mixing roll, and there by a severe strainon the apron. at one side ll; or the other this strain or pull will betrans mitted through the apron to the roll 16, and thence to one or theother of said rods 47, which will thereby be pulled fOl'Wlllll. inopposition to the spring 60 thereon. as beii fore explained. Not onlywill this syn-ing resist this movement. and will return the rod to itsnormal position when the strain on the apron is relieved: but as thespring .is additionally compressed it will push the no bearing brackets21 forward and cause tlr roll to clamp the apron between it and the roll37 with greater pressure and thereby to a greater degree oppose thetendency of the apron to move laterally. It is ale however, that whenone of the rorh. moved as stated the other shall more in like manner.Therefore at th rear end of the machine a rock shaft 7*) is mounted inbearings fixed to the apron Two arms 71 are 130 fixed to it, and arerespectively located near the rear ends of the rods l7. Pins 47* fixedto these rods go into slots 72 in the arms 71. This mechanism causesbot-h rods to move equally in the same "direction.

In addition to the feedapron 30 there is an auxiliary feed apron 10which runs over and embraces the two r'oflls 17 and 3'7 before referredto, and athird roll'18 adjacent to roll 17 near the rear. ofthepain-said rolls being placed so that the upper leg of the apron 4:0 willbe held in contact-with the lower leg of the apron 30, and will extendslightly beyond both ends. As shown, the two rolls 1? and lB are mountedin the same brackets lei which support the roll 16; and roll 17 islocated above roll 16 so that the apron 40 is held against that part ofapron 30 whichis passing up around roll 16. A scraper maybe securedtothe brackets 14 in front of roll 1'7, and extended over apron 30between-it and apron 40, so as to be able to scrape. from this latterany matcrial which might otherwise adhere thereto. Sometimes soine ofthe rubber inay be car' ried' up by the apron. Sometimes the powderedchemical which is being mixed with the rubber will be carried up by theapron over roll 28. In either event the tcrial so carried over will gowith the apron, or willvfall by gravity into the projecting front end ofthe auxiliary apron This material will then go along ith apron 4lO,-andbetween itandthe apron 30- It will thereby 'be prevented from droppingoff into-the pan. The scraper 80 will insure that this compound shallagain be can ried around by apron 30 and op-in contact with roll 10.

Two levers '33, are pivoted to opposite sides of the pan, at pointswhich are. approximately concentric with the roll 22,- they extendforward therefrom. The roll 37 extends between and is rotatably mountedat its ends in these two levers 33. The front ends of these levers areconnected respectively with the two cylinders 26 b3 means'of the rods34/ In the construction shown. a box 4-3 swi eled on a ho' izontal axisto the front end ol each lever 33. The lower end of each rod. pissesthrough a boxed and is held therein against 'endwise movement. l\";l'.\\{i nuts 34. The mi -per end of each rod Ii l passes tl rough abox which is swirelml on a horizontal axis to the associated orlim'lerand a nnt 36 on said rod li'miis tw downward moveme Q of These nutsin... 'I'lllXll thrush-1n agar e nnxin; ilrz'ral'trr. n all of theconditions or use. that is to 5. whe either i moving slightly u;

down. or

and

loosened, certain flexible flanges 77 will sag into vertical or nearlyvertical positions, and any coniponnd'thereon will fall upon the apron.These flexible flanges 77 are, or may be secured to opposite sides ofthepan, and extend inward over the sides of the apron, and normally restattheir inner edges on said feed apron 30. They will catch any of thecompound which falls from between the mixing rolls and wnich otherwisemight not land on the apron.

Having described my invention, I claim:

1. In combination with the mixing ro'lls of-a mixing mill of an endlessfeed apron. three rolls over which said apron rnns,two of said rollsbeing located in planes below" the mixing rolls, two arms whiclrarepivoted at their lower ends and which, when in operative positions.extend therefrom upward adjacent to one of the mixing rolls, a membermounted on each' of said arms andslidable up and down thereon, therebeing an inclosed space between a part of each'arman'dsaid sl'idablemember thereon, and means for de.

livering an elastic-pressure fiuid' into-said each of said arms beingprovided-with a piston, a cylinder shdably mounted upon each PlStOl'land carrying bearings for the ends of the third apron roll, and meansfor delirering an elastic pressure fluid nnder press ire into eachcylinder above the piston combination with the mixing rolls ng mill. anendless feet. apron there- H er which said apron runs being located inplanes be mixing rolls. two arms piroterl oi: lower ends rand extendingnpw; alone f 0. mix

will. under all conditions of p third apron roll, each of said armshaving a longitudinal duct which at its up er end communicates with thespace wit in the cylinder and above the piston, and feed pipes incommunication with the lower endsof said ducts.

l. In'combination with the mixing rolls of a mixing mill, an endlessfeed apron therefor, three rolls over which said apron'runs,- two ofsaid rolls being located in planes below the mixin rolls,two armspivoted at their. lower ends and extending upward adjacent to one of themixing rolls, bearing brackets carried by said two arms',.the thirdapron roll being extended between and mounted in said bearing brackets,an auxiliary endless apron, and, rolls over which saidapron' runs, saidrolls being so located that the up er leg of said supplemental apron ishe d in contact with the lower face of the lower leg of the feed apron.

5. In combination with the mixing rolls of a mixing mill, an endlessfeed apron therefor, three rolls over which said apron runs, two of saidrolls being located in planes below the mixing rolls, two arms pivotedat their lower ends and extending upward alongside of one of the mixingrolls, bearing brackets carried by said,- two arms,-the third apron rollbeing extended between and mounted in said bearing brackets, anauxiliary endless-feed apron located below the feed apronfirst'mentioned with its up e'r leg in contact with the lower leg of therst mentioned apron, and extended at both ends beyond the lower leg ofsaid first mentioned feed apron, and rolls over which said auxiliaryapron runs.

6. In combination with the mixing rolls of a-mixing mill, an endlessfeed apron therefor, three rolls over which said apron runs. two of saidrolls being located in planes be low the mixing rolls, two arms pivotedat their lower ends and extending upward alongside of one of the mixingrolls, hearing brackets carried by said two arms, the third apron rollbeing extended between and mounted in said bearing brackets, anauxiliary endless feed apron located below the feed apron firstmentioned with its upper leg in contact with the lower leg of the firstmentioned apron and extended at both ends beyond the lower leg of saidfirst mentioned' feed apron, rolls over which said auxiliary apron runs,and a scraper which extends over the upper leg of the auxiliary feedapron.

7. In combination with the mixing rolls of a mixing mill, an endlessfeed apron therefor, three rolls over which said apron runs, one of saidrolls when in working position being in a position which slightlyoverhangs one of the mixing rolls and the other two rollsbeing locatedin planes below the mixing rolls, a pressure roll'palallel with ward atan angle toward one of the mixing rolls, the third apron roll beingmounted in the upper ends of said rods, and a roll mounted on an axiswhich is adjacent and parallel to one of the first two mentioned apronrolls, and means for relatively mov ing one of said two adjacent rollstoward the other to clamp said aprons from side Y toside between said;rolls.

9. In combination with the mixing rolls of amixing mill, an endless feedapron therefor, three rolls overfivvhich said apron runs, two of saidrolls being located in planes below themixing' roll, two arms piv' otedat their lower ends and extending upward alongside of one of the mixingrolls, bearing brackets carried by said two arms, the third apron. rollbeing extended be tween and mounted in said bearing brackets, twomovable bearing br ickets in which that one of the-lower apron rolls ismounted which is nearest to the upper apron roll,

a pressure roll' parallel with and adjacent to,the last mentioned lowerapron roll, and springs acting on the-bearing brackets of said apronroll'to yieldingly move them toward said pressure roll to causethe apronto be clamped between the said two rolls.

10. In combination with the mixing rolls of a mixing mill, an .endlessfeed apron therefor, three rolls over which said apron runs, two of saidrolls being located in, planes below said mixing lrolls, two armspivoted at their lower ends and extending therefrom upward alongside ofone of the mixing rolls, members slidably mounted upon said pivoted armsand carrying bearing brackets'in which the third apron roll is mounted,means yieldingly impelling said slidable members to move up onsaid-rods,

an auxiliary apron, rolls over which said auxiliary apron, runs, whichrolls are so located that the upper leg of'the auxiliary apron is heldin contact with the lower face of the lower leg of the feed apron, twopivoted levers between which one of the rollers for the auxiliary apronextends, and in which it is mounted, and connections be tween saidlevers and the slidable members on the pivoted rods.

11. In combination with the mixing rolls of a mixing mill, an endlessfeed apron, three rolls over .avhich said-apron runs, two of said rollsbeing located in planes below the mixing roll, bearing brackets in whichsaid lower rolls are mounted, endo movahle horizontal bars to which thewarms? brackets of one roll are fixed,

li'gfh acting on said bars to yieldingly retheir movement in the apronloosening iiertion, two pivoted arms whichexteud iron; their pivotalsupport upward alonguitlt of one of the mixing rolls, a member Jidai tvmounted on each of said arms and rarrving hrackets in which the thirdroll is mounted, and means for vieltlingly pressing said members upwardon their supporting arr 1 and means compelling both bars to more sil'nultaneously and equally in the HBITIC direction.

153, The combination with the mixing rolls of a mixing mill, an endlessfeed apron tl'ieret'or, three rolls over which said apron runs. two ofsaid rolls heing located in planes below said mixing rolls, two armspivoted at their lower ends and extending th retroni upward adjacent. toone ofthe mixing rolls. members slidahly mounted upon mild pivoted armsand carrying hearii'iejs in which the third apron roll is mounti meansjvieldingly impelling said slidahle nwmhers to move upward on said rods,an inxiliaiw apron, rolls over whirh said a uxil iar apron runs. whichrolls are so located that the upper leg ot the auxiliary apron is i 2:in 'eoiuact with the lower leg of the feed apron, two pivoted le ershetween whi h one of the rollstor the auxiliary apron rxttnds and inwhich it is rotatul lfl mounted. and connections: hetween said vers and.the slidahle :nenihers on the pix oted rods.

1 In combination with the mixing rolls of a mixing mill, an endless feedapron therefor. three rolls over which said apron runs, two of saidrolls being located in planes below the mixing roll, two arms piv otedat their lower ends and extending thereivom upward adjacent to one ofthe mixing rolls. memhers slidahly mounted upon said pivoted armscarrying hearings in which the third apron roll is mountethnieansyieldingl impelling said slidahlo memhers to moviupward on said rods,slidaiile hearing Markets tor that one of the two lower apron roll whichis nearest the upper apron roll. prings acting on said hearing bracketsto iazove them in the hell: tightening direction, an auxiliary apron.rolls: over which said uxiliary apron runs, which rolls are so loratedtll;.., the upper leg of the auxiliary apron is held in contact with thelower leg of the feed apron, two pivoted levers in which ono ol' theauxiliary apron rolls is roialahlv mounted in such relationsubstantially as shown to the adjacent movable roll of the main feedapron that said apron may he clamped hetween said rolls. and connectionhetweeu said le 'ers and the slidahle TEHFUlIPlS on the pivoted rods.

it. In combination with the mixing rolls of a mixing mill, an endlesteed agnoiz, three roll. over whita i pivoted arms which three rollsover whieh two pivoted arms Wllhil i-xn m n nevotal SIIIPPOI't upward atmixing rolls. a member i each of said arms and can which one of saidthree few. ed, two horizontal Clint itae ino ziiiie cated below themixing rolls. two healing brackets respectively secured to said bars inwhich hearing brackets one of said three api on ro is mounted, twobrackets slidahle in paths paral el w l aid liars. n brat lode the thirdan on Fall is a; prings ting to mm a the last Evfi: tinned l: ringhracltrts in UNP tliht 5 tn harr in the reverse direction and niranei'oinpeliing both lane to more hunt tancousrv and equally in the samedirection. it in combination ith the mixing rolls of a mixing mill. ofan endless feed apron, tin:- e rolls over which said apron runs.--two ofsaid rolls oi ing located. in planes la'low the mixing rolls. two armshich are pis oted at their tower ends and which, when in operativepositions. extend therefrom upward l ide of one of the mixingrolls.-each aid arms having a piston lixed to it near upper eirl. anextension member in the form of a i-vhader which embraces Faiil pistonand i. i lahly mounted thereon, means for deliiering' an. elasticpressure fluid into the spam in mid cylinder ahove said iston. the thirdapron roll he ng extended lwtam-n and mounted in hearings rairied l 'vsaid two extension meinimrs, and means to! limit ing the upwardmoveu'ient or said extension members.

17. In comh iation with the mixing r lls of a mixing miil. an endlessfeed apron therefor, three rolls over which the. feed apron runs, two ofsaid rolls being located in'planes below the mixing roll, two armspivoted at their lower ends and extending therefrom upward alongside oneof th o l;- ing rolls, bearings carried by said two piv- Med arms,--thethird apron roll being extended b ween and. mounted in said bearandflexible flanges which extend over i of: the upper horizontal leg of the"iiili'flillltllll for mixing mills em- ,ipport adapted to be secured toE undwnmlli the milling rolls thereof,

' W said support, shelves over the side edges of Ming means for the ormixing mills emdapted to be secured milling rolls there- 5 by saidframe. shelves m5; over the side edges of the apron. and. controllingmeans for the apron,

20. The combinalimi with the milling rolls at a mixing mill, of spacedrollers below a roller above said spaced rollie 1' u Hid rol mounted toslide toward and away from fjopies of said spaced rollers, an endlessapron trained over said rollers, shelves above said spaced rollersextending over the side edges of said apron, and means for yieldablyholding the slidably mounted roller at its upper limit of movement.

21. An attachment for mixing mills embodying a support adapted to besecured to a mill underneath the milling rolls thereof, spaced rollerscarried by the support, a roller carried above and mounted to slidetoward and away from the support, an apron trained over said rollers,shelves above and extending over the side edges of the apron, and meansfor yieldably holding the slidably mounted roller at its upper limit ofmovement.

In testimony whereof, I hereunto affix my signature in the presence oftwo witnesses.

PARK E. WELTON. Witnesses THEo. V. BUsK, CHAS. H. WELLS.

this patent may be obtained for five cents each, by addressing theCommissioner of Patents,

Washington, D. C.

